650 PROF. F. J. BELL ON A CRINOID FROM [Nov. 14, 
DESCRIPTION OF PLATE XLVIII. 
Fig. 1. Psolus (Lophothuria) peronit, n. sp. Upper view: nat. size. 
- . Portion of trivial surface (to show arrangement of 
suckers): nat. size. 
1. Pharynx of P. peronii. 
le. Spicule of P. peronii. 
2. Psolus (Hypopsolus) ambulator, n. sp. Upper view : nat. size. 
F Portion of trivial surface (to show arrangement of 
suckers) : nat. size, 
2. Outline view from the side, to show general configuration. 
8. Enlarged view of portion of dorsal surface of P. regalis, to show the 
granular scales. 
4. Enlarged view of portion of dorsal surface of P. fabricii, to show the 
granulated plates. 
5. Note on a Crinoid from the Straits of Magellan. 
By F. Jerrrey Betz, M.A., F.Z.S. 
[Received October 23, 1882.] 
In the last set of specimens received from Dr. Coppinger (Surgeon, 
H.M.S. ‘ Alert’) is a single example of a Crinoid from the Straits 
of Magellan, which, by some accident, was not forwarded along with 
the other Echinodermata sent by him some time ago. In giving an 
account of that collection to the Society’, I directed attention to 
the absence of any representative of the Crinoidea; and I might have 
added that, so far as I knew, no other explorer of the marine fauna 
of the region from which it came had been able to meet with one. 
It was therefore with considerable interest that I noted the ar- 
rival of this specimen in the British Museum; and I may add that 
I looked upon it with no little astonishment, as I conjectured how 
Dr. Coppinger must have doubted within himself whether he were 
really south of the Equator, and not again in those Arctic regions 
where Antedon eschrichti is so abundant; for it requires not only 
some acquaintance with specific characteristics to be able to detect 
any difference between the northern and the southern forms, but 
such differences as there are are exceedingly minute. 
I have endeavoured to examine fully and carefully into the cha~ 
racters of the single, not quite complete, specimen of the Antarctic 
form ; and although one may detect, on comparison with any given 
Arctic specimen, certain differences, such as may be expressed by 
saying that the cirri are a little more delicate, or not quite so long, 
or that a rather more distal joint is the longest of the series, yet 
marks such as these cannot be held to be distinctive of any thing 
more than of individuals. 
When, however, we examine the pinnules, we find differences 
which enable us to distinguish the one from the other. As is well 
known, the pinnules at about the middle of the arm in A. eschrichti 
have the two basal joints of a notable shape, and so formed as to 
leave an interspace between them; in the Antarctic form, on the 
1p, Z. 8. 1881, p. 87. 
